public class Main {
    public static void main(String[] args) {
        System.out.println("Hello world!");
        System.out.println("main");
        System.out.println("main");
        System.out.println("main");
        System.out.println("main");
        System.out.println("main");
        System.out.println("main");
        System.out.println("main");
        System.out.println("刘宇航1");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
        System.out.println("lk");
    }
    public static void liutest(String[] args) {
        System.out.println("刘宇航");
        //vvvv
    }
}